| 摘要 |
PURPOSE:To improve utilizing ratio of laser beam energy by equalizing a plane of polarization of the laser beam passing through clotted part on liquid crystal mask and a plane of polarization of the laser beam passing through gap part between the dotted parts and marking with a beam splitter. CONSTITUTION:As the beam splitter 7 is set so that the laser beam passing through the dotted part in the liquid crystal mask 4 for reflecting the marking contents can penetrate, the laser beam penetrating the gap part between the dotted parts on the marking surface can be worked so as to contain the marking contents. That is, the laser beam, too, penetrating the gap part between the dotted parts can be used as the marking contents with the beam splitter 7. By this method, the laser beam energy passing through the gap part between the dotted parts, can be effectively utilized and the large area marking can be executed. Further, the marking letter comes to plane letter from the dotted letter and the clear marking is executed. |
